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2006 Mar 15
0
implicit grant unmap hacking [was RE: Grant tables from dom0 userspace?]
...hen detecting a pte with the _PAGE_GNTTAB bit set. I never see the printk() when the OS squashes the mapping PTE. Instead, I get the backtrace I already mentioned, namely: (XEN) [<ff13603e>] put_page_from_l1e+0xd0/0x1af (XEN) [<ff13a891>] revalidate_l1+0x159/0x168 (XEN) [<ff13aac1>] ptwr_flush+0x221/0x32f (XEN) [<ff13b6a7>] cleanup_writable_pagetable+0x5c/0x7d (XEN) [<ff137c20>] do_mmuext_op+0x85/0x8c1 (XEN) [<ff149e0f>] hypercall+0x8f/0xaf I was hoping that ptwr_do_page_fault() would happen first, but it doesn''t happen at all. I conc...